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        <h1 id="JavaScript设计模式面试真题-一"><a href="#JavaScript设计模式面试真题-一" class="headerlink" title="JavaScript设计模式面试真题(一)"></a>JavaScript设计模式面试真题(一)</h1><h2 id="一"><a href="#一" class="headerlink" title="一"></a>一</h2><h3 id="题目"><a href="#题目" class="headerlink" title="题目"></a>题目</h3><p><img src="https://blog-1252832257.cos.ap-shanghai.myqcloud.com/20190724/ques.PNG" alt="quesiton"></p>
<ul>
<li>画出UML类图</li>
<li>用ES6语法写出该示例</li>
</ul>
<h3 id="解答"><a href="#解答" class="headerlink" title="解答"></a>解答</h3><p><img src="https://blog-1252832257.cos.ap-shanghai.myqcloud.com/20190724/UML-1.PNG" alt="answer"></p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Car</span></span>&#123;</span><br><span class="line">    <span class="keyword">constructor</span>(number,name)&#123;</span><br><span class="line">        <span class="keyword">this</span>.number=number</span><br><span class="line">        <span class="keyword">this</span>.name=name</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">kuaizhe</span> <span class="keyword">extends</span> <span class="title">Car</span></span>&#123;</span><br><span class="line">    <span class="keyword">constructor</span>(number,name)&#123;</span><br><span class="line">        <span class="keyword">super</span>(number,name)</span><br><span class="line">        <span class="keyword">this</span>.price=<span class="number">1</span>    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">zhuanche</span> <span class="keyword">extends</span> <span class="title">Car</span></span>&#123;</span><br><span class="line">    <span class="keyword">constructor</span>(number,name)&#123;</span><br><span class="line">        <span class="keyword">super</span>(number,name)</span><br><span class="line">        <span class="keyword">this</span>.price=<span class="number">2</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Trip</span></span>&#123;</span><br><span class="line">    <span class="keyword">constructor</span>(car)&#123;</span><br><span class="line">        <span class="keyword">this</span>.car=car</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    start()&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">`开始，名称：<span class="subst">$&#123;<span class="keyword">this</span>.car.name&#125;</span>,车牌号：<span class="subst">$&#123;<span class="keyword">this</span>.car.number&#125;</span>`</span>)</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    end()&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">`借宿，金额：<span class="subst">$&#123;<span class="keyword">this</span>.car.price*<span class="number">5</span><span class="string">`)</span></span></span></span><br><span class="line"><span class="string"><span class="subst"><span class="string">    &#125;</span></span></span></span><br><span class="line"><span class="string"><span class="subst"><span class="string">&#125;</span></span></span></span><br><span class="line"><span class="string"><span class="subst"><span class="string"></span></span></span></span><br><span class="line"><span class="string"><span class="subst"><span class="string">let car =new kuaiche(100,'kuai')</span></span></span></span><br><span class="line"><span class="string"><span class="subst"><span class="string">let trip=new Trip(car)</span></span></span></span><br><span class="line"><span class="string"><span class="subst"><span class="string">trip.start()</span></span></span></span><br><span class="line"><span class="string"><span class="subst"><span class="string">trip.end()</span></span></span></span><br></pre></td></tr></table></figure>

<h2 id="二"><a href="#二" class="headerlink" title="二"></a>二</h2><h3 id="问题"><a href="#问题" class="headerlink" title="问题"></a>问题</h3><p><img src="https://blog-1252832257.cos.ap-shanghai.myqcloud.com/20190724/ques-2.PNG" alt="ques"></p>
<h3 id="解答-1"><a href="#解答-1" class="headerlink" title="解答"></a>解答</h3><p>UML<br><img src="https://blog-1252832257.cos.ap-shanghai.myqcloud.com/20190724/uml-2.PNG" alt="ans"></p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Car</span></span>&#123;</span><br><span class="line">    <span class="keyword">constructor</span>(num)&#123;</span><br><span class="line">        <span class="keyword">this</span>.num=num</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 摄像头</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Camera</span></span>&#123;</span><br><span class="line">    <span class="comment">// constructor</span></span><br><span class="line">    shot(car)&#123;</span><br><span class="line">        retrun &#123;</span><br><span class="line">            num:car.num</span><br><span class="line">            inTime:<span class="built_in">Date</span>.now()</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Screen</span></span>&#123;</span><br><span class="line">    show(car,inTime)&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(car.num)</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="built_in">Date</span>.now()-inTime)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Park</span></span>&#123;</span><br><span class="line">    <span class="keyword">constructor</span>(floors)&#123;</span><br><span class="line">        <span class="keyword">this</span>.floors=floors||[]</span><br><span class="line">        <span class="keyword">this</span>.camera=<span class="keyword">new</span> Camera()</span><br><span class="line">        <span class="keyword">this</span>.screen=<span class="keyword">new</span> Screen()</span><br><span class="line">        <span class="keyword">this</span>.carList=&#123;&#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">in</span>(car)&#123;</span><br><span class="line">        <span class="keyword">const</span> info =<span class="keyword">this</span>.camera.shot(car)</span><br><span class="line"></span><br><span class="line">        <span class="keyword">const</span> i =<span class="built_in">parseInt</span>(<span class="built_in">Math</span>.random()*<span class="number">100</span>%<span class="number">100</span>)</span><br><span class="line">        <span class="keyword">const</span> place=<span class="keyword">this</span>.floors[<span class="number">0</span>].place[i]</span><br><span class="line">        place.in()</span><br><span class="line">        info.place=place</span><br><span class="line"></span><br><span class="line">        <span class="keyword">this</span>.carList[car.num]=info</span><br><span class="line">    &#125;</span><br><span class="line">    out(car)&#123;</span><br><span class="line">        cosnt info=<span class="keyword">this</span>.carList[car.num]</span><br><span class="line">        cosnt place=info.place</span><br><span class="line">        place.out()</span><br><span class="line"></span><br><span class="line">        <span class="keyword">this</span>.screen.show(car,info.inTime)</span><br><span class="line"></span><br><span class="line">        <span class="keyword">delete</span> <span class="keyword">this</span>.carList[car.num]</span><br><span class="line">    &#125;</span><br><span class="line">    emptyNum()&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">this</span>.floors.map(<span class="function"><span class="params">floor</span>=&gt;</span>&#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="string">`<span class="subst">$&#123;floor.index&#125;</span>层还有<span class="subst">$&#123;floor.emptyPlace&#125;</span>`</span></span><br><span class="line">        &#125;).join(<span class="string">'\n'</span>)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 层</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Floor</span></span>&#123;</span><br><span class="line">    <span class="keyword">constructor</span>(index,places)&#123;</span><br><span class="line">        <span class="keyword">this</span>.index=index</span><br><span class="line">        <span class="keyword">this</span>.palces=places||[]</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    emptyPlaceNum()&#123;</span><br><span class="line">        <span class="keyword">let</span> num=<span class="number">0</span></span><br><span class="line">        <span class="keyword">this</span>.places.forEach(<span class="function"><span class="params">p</span>=&gt;</span>&#123;</span><br><span class="line">            <span class="keyword">if</span>(!p.empty)&#123;</span><br><span class="line">                num+=<span class="number">1</span></span><br><span class="line">            &#125;</span><br><span class="line">        &#125;)</span><br><span class="line">        <span class="keyword">return</span> num</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Place</span>()</span>&#123;</span><br><span class="line">    <span class="keyword">constructor</span>()&#123;</span><br><span class="line">        <span class="keyword">this</span>.empty=<span class="literal">true</span></span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">in</span>()&#123;</span><br><span class="line">        <span class="keyword">this</span>.empty=<span class="literal">false</span></span><br><span class="line">    &#125;</span><br><span class="line">    out()&#123;</span><br><span class="line">        <span class="keyword">this</span>.empty=<span class="literal">true</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//test------------------</span></span><br><span class="line"><span class="keyword">const</span> floors=[]</span><br><span class="line"><span class="keyword">for</span>(<span class="keyword">let</span> i=<span class="number">0</span>;i&lt;<span class="number">3</span>;i++)&#123;</span><br><span class="line">    <span class="keyword">const</span> places=[]</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">let</span> j =<span class="number">0</span>;j&lt;<span class="number">100</span>;j++)&#123;</span><br><span class="line">        places[j]=<span class="keyword">new</span> Place()</span><br><span class="line">    &#125;</span><br><span class="line">    floors[i]=<span class="keyword">new</span> Floor(i+<span class="number">1</span>,places)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> park=<span class="keyword">new</span> Park(floors)</span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> car1= <span class="keyword">new</span> Car(<span class="number">100</span>)</span><br><span class="line"><span class="keyword">const</span> car2= <span class="keyword">new</span> Car(<span class="number">200</span>)</span><br><span class="line"><span class="keyword">const</span> car3 =<span class="keyword">new</span> Car(<span class="number">300</span>)</span><br><span class="line"></span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">'car1 in'</span>)</span><br><span class="line"><span class="built_in">console</span>.log(park.emptyNum())</span><br><span class="line">park.in(car1)</span><br><span class="line"></span><br><span class="line">park.out(car1)</span><br></pre></td></tr></table></figure>


      
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